Improvement in spark-arresters



D. R. PROCTUR.

Spark-Arrester. N0.l64,393 Patentedlune15,1875.

' WITNESSES; INVENTOR.-

THE GRAPH IC C(LPNOIO LIItLIiQ & 41PARK PLACE, N.Y.

DAVID R. PROCTOR, OF GLOUCESTER, MASSACHUSETTS, ASSIGNOR TO THE PROOTORSPARK-ARRESTER COMPANY, OF SAME PLACE.

IMPROVEMENT IN SPARK-ARRESTERS.

Specification forming part of Letters Patent No. 164,393, dated June 15,1875 application filed April 28, 1875.

To all whom it may concern:

Be it known that I, DAVID R. Pnooron, of Gloucester, in the county ofEssex and State of Massachusetts, have invented certain new and usefulImprovements in Spark-Arresters; and I do hereby declare that thefollowing is a full, clear, and exact description thereof, which willenable others skilled in the art to which it pertains to make and usethe same, reference being had to the accompanying drawings and to theletters of reference marked thereon, which form a part of thisspecification.

My invention relates to improvements on the patent granted to me on the19th day of December, 1871, No. 122,058, for spark-arresters andconsists in providing a curved smokestack with two screens at or nearits upper end, in combination with two return-pipes or conductors forthe sparks and cinders. The mouth of the first return-pipe is located atthe rear of the stack and a little below the first screen. Thisreturn-pipe leads to the furnace, and serves to convey the larger sparksand cinders that are capable of being utilized as fuel back again to thefurnace to be there consumed. The second return -pipe is also located atthe rear of the smoke-stack, and enters the latter between the first andsecond screens, and serves for the purpose of conveying the fineparticles of sparks and cinders, that are incapable of being again usedas fuel, and which have passed through the first screen, to the sand-boxor any other suitable receptacle, or to be delivered on the track, asmay be desirable. The first screen is made coarse, so as to allow finesparks and cinders to pass through it, and to arrest and convey only thelarge ones to the furnace, whereas the second screen is made so fine asto arrest nearly all the cinders that have escaped through the firstscreen, and to convey them to the sandbox or other convenientreceptacle. The first screen, being coarse, covers the whole area of thestack where it is located, 291d this may be done without diminishing thedraft very Inaterially but the upper fine screen may, if so desired, bemade to cover only a part of the stack at or near the place where thecinders would be likely to strike, whereas the remainder of the area ofthe stack may be left open and unobstructed, so as not to interfere withthe draft. The gentle curve of the stack and of the return-pipes forthecinders assists very materially in conduotin g the sparks and cinders tothe furnace, and the sand-box or other required place, withoutinterfering with the draft; and, furthermore, the draft in the furnacecreates, as it were, a partial vacuum in the pipeleading from the stackto the furnace, by which the large cinders are drawn as well aspropelled to thefurnacefromthe stack.

A part of the exhaust steam that escapes through the stack is conductedto the furnace, and, being there decomposed into its elementary gases,increases the combustion in the furnace.

On the accompanying drawings, Figure 1 represents a side elevation of myinvention. Fig. 2 represents a central longitudinal section, and Fig. 3represents a ground plan of the same.

Similar letters refer to similar parts wherever they occur on thedifferent parts of the drawing.

(0 represents an ordinarylocomotive or other boiler. b is thesmoke-stack, and c is the sandbox. The smoke-stackbis curved in an Sshape, as shown, and provided, first, with a coarse screen, d, thatcovers the whole of the area of the smoke-stack at the place where saidscreen is located. An aperture is made in the rear of the stack,directly below the coarse screen d, leading into the flue or pipe 6, therear of which enters the furnace at e, and projects into the furnace,where an aperture, f, is made on the under side, so as to deposit thecinders that are conveyed from the smoke-stack directly onto the gratein the furnacef Above the coarse screen dis a secondary finer screen, 9,located as shown, which screen may be made to cover the whole or part ofthe top of the smoke-stack. Between the screens 01 and g is made anaperture at the rear of the stack, leading into the pipe h, throughwhich the line cinders that have passed through the first screen at areconveyed to the sand-box c or other desired place.

It will thus be seen that by the employment of a coarse and a finescreen in the stack, and their respective return-pipes, I am able todiride the cinders into coarse and fine parts. The coarse ones, beingcapable of recombustion, are returned to the furnace, whereas the finerones are arrested and conveyed to the sandbox or other suitablereceptacle.

I am aware that a patent was granted on the 21st day of May, 1872, to J.R. Moffitt, for spark-arresters, in which two screens and two pipes areused, the said pipes, however, being united together, and therebyconveying both coarse and fine sparks and cinders through one finaldelivery-pipe. This is not my invention, and I do not claim such anarrangement; but

What I wish to secure by Letters Patent and claimis- In combination withthe smoke-stack I) and its screens d and g, the independent pipe 6,leading from an aperture in the smoke-stack below the screen 61 to thefurnace, and the independent pipe h, leading from an aperture in thesmoke-stack below the screen 9 to the sand-box c or suitable receptacle,as and for the purpose herein set forth and described.

In testimony that I claim the foregoing as my own inventionI haveaffixed my signature in presence of two witnesses.

DAVID R. PROGTOR. Witnesses:

Enw. G. HIGHT, ALBAN ANDREN.

